JP2984113B2 - Product removal control device of molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a product take-out control device of a molding machine, and can be used in a take-out portion of a molded product when performing die casting of metal or injection molding of synthetic resin.

[0002]

2. Description of the Related Art Conventionally, in metal die-casting and injection molding of synthetic resin, a product extruding device for extruding a product molded in a mold and a product removing device for taking out the extruded product out of the mold have been used. ing.

FIG. 4 shows a conventional dukast machine 10. Die casting machine 10, moving die plate 11
And a fixed die plate 12, each having a movable mold 13
And the fixed mold 14 is attached. Moving die plate 11
Is moved toward and away from the fixed die plate 12 by a mold clamping mechanism (not shown), whereby the movable mold 13 and the fixed mold 14 are clamped or opened. Then, the product 15 can be molded by injecting and filling a molten metal into the internal cavities of the movable mold 13 and the fixed mold 14 in the clamped state.

[0004] A molded product 15 is taken out of a movable mold 13.
This is performed with the fixed mold 14 opened. At this time, the product 15 is designed to remain on the moving mold 13 side, and in order to remove the product 15 remaining on the moving mold 13,
A product extrusion device 20 is installed on the movable die plate 11. Further, in order to take out the product 15 removed by the product push-out device 20, a product take-out device 30 is installed in the vicinity of the installation site of the fixed die plate 12.

The product extrusion device 20 has a rod-shaped extrusion member 21 which penetrates the movable die plate 11 so as to be able to advance and retreat in the axial direction.
The base end of the pushing member 21 is connected to a pushing plate 22 along the back side of the movable die plate 11. An extruding rod 24 is connected to the tip of the extruding member 21 via an extruding plate 23, and the extruding rod 24 is penetrated to the movable mold 13 so as to be able to advance and retreat, and the tip can protrude toward the product 15 side of the movable mold 13. It is. Extrusion plate 22
Is the extrusion guide rod 25 fixed to the movable die plate 11
And is connected to the movable die plate 11 via an extrusion cylinder 26.

A hydraulic supply 28 is connected to the extrusion cylinder 26 via a solenoid valve 27.
By switching 27, the contraction and extension of the extrusion cylinder 26 can be controlled. Then, the extrusion cylinder 26 is contracted to move the extrusion plate 22 along the extrusion guide rod 25, and the tip of the extrusion rod 24 is protruded from the movable mold 13 to push out the product 15 remaining in the movable mold 13. Is configured. A flow control valve 29 is provided between the switching valve 27 and the hydraulic supply source 28, and the movement speed of the extrusion cylinder 26 or the extrusion rod 24 can be adjusted by limiting the flow rate of the working oil with the flow control valve 29. It has become.

[0007] In order to control the operation of the product extruder 20, an extrusion control means 40 is connected to the product extruder 20. The extrusion control means 40 is also used as a control panel of the die casting machine 10 and operates the product extrusion device 20 at a predetermined timing based on a series of sequences such as mold clamping, mold opening and molten metal injection.

[0008] The product take-out device 30 is a chuck portion for holding the biscuit portion 16 of the product 15 to be removed by the product push-out device 20.
This chuck portion 31 has an arm 32, an upper saddle 33,
It is supported via a lower saddle 34 and a beam 35.

The arm 32 is vertically expandable / contractible by a hydraulic / pneumatic cylinder (not shown), and its lower limit is set at a position where the chuck portion 31 is concentrically opposed to the biscuit portion 16 of the product 15, and its upper limit is It is set at a position outside the molds 13 and 14. The arm 32 is supported by the upper saddle 33 via a rail 51 and a slide bearing 52, and is movable from a state in which the chuck portion 31 is inside the molds 13, 14 to a state in which the chuck portion 31 projects to the side outside.

The upper saddle 33 is slidably supported by the lower saddle 34 in the mold clamping direction, and is movable in the same direction by a take-out cylinder 53. The lower saddle 34 is guided and supported by a rail 54 attached along a beam 35. Rack 55 for beam 35
A motor 56 is installed on the lower saddle 34, and a pinion (not shown) attached to the motor 56 is engaged with the rack 55, and the lower saddle 34 can run with respect to the beam 35 by rotation of the motor 56.

A hydraulic pressure source 59 is connected to the take-out cylinder 53 via an electromagnetic directional switching valve 57 and a proportional flow control valve 58. The direction switching valve 57 can switch between a state in which the hydraulic oil from the hydraulic pressure source 59 is supplied to the forward side of the take-out cylinder 53, a state in which the hydraulic oil is supplied to the reverse side, and a state in which the hydraulic oil is not supplied. The proportional flow control valve 58 adjusts the flow rate of hydraulic oil from the hydraulic power source 59 by an external signal. The take-out cylinder 53 can be driven in a predetermined state according to the settings of the direction switching valve 57 and the proportional flow control valve 58.

The product take-out device 30 operates as follows. Normally, the chuck unit 31 waits outside the molds 13 and 14 in a state where the chuck unit 31 is retracted (the side opposite to the product 15). Following the mold opening after molding, the arm 32 descends and enters the inside of the molds 13 and 14, and the upper cylinder 33
Moves forward, and the chuck section 31 chucks the product 15 extruded by the product pushing device 20. Then, the upper saddle 33 is retracted by the take-out cylinder 53 to separate the product 15 from the movable mold 13, and the arm 32 is moved up and out of the molds 13 and 14, so that the product 15 is taken out.

In order to control the operation of such a product take-out device 30, take-out control means 60 is provided. The take-out control means 60 is constituted by a sequencer or the like in which an operation program is set in advance, and its output is connected to a proportional flow control valve 58 via an amplifier 61. Further, a signal during the extrusion operation from the extrusion control means 40 is input to the input of the ejection control means 60, and the upper saddle driven by the ejection cylinder 53 is provided.
The output of the take-out stroke detecting means 62 for detecting the movement of 33 is connected.

The take-out stroke detecting means 62 includes a lower saddle 34
It has a rotary encoder 63 supported on its side, and a pinion 64 attached to its detection shaft is engaged with a rack 65 fixed along the upper saddle 33. Rotary encoder
A pulse train corresponding to the rotation angle is output from 63, and the number of rotations is detected by counting the pulses, and the take-out stroke can be detected from the rotation angle.

The take-out control means 60 is activated when the product push-out device 20 pushes out the product 15 by a control signal from the push-out control means 40, and operates the product take-out device 30 to cause the chuck portion 31 to feed the product 15. While moving, the product 15 is moved while monitoring the movement by the extraction stroke detection means 62.
Pull out from the mold 13 and take it out of the molds 13 and 14. On this occasion,
The take-out control means 60 adjusts the proportional flow control valve 58 while monitoring the movement amount of the take-out cylinder 53 or the upper saddle 33 detected by the take-out stroke detection means 62, and adjusts the product 15 and the movement based on a preset operation program. The positioning or moving speed of the chuck portion 31 with respect to the mold 13 is adjusted.

[0016]

By the way, in the conventional die casting machine 10 as described above, a product extruding apparatus is used.
When extruding the product 15 with 20, this product 15 will be
In order to prevent the product 13 from falling off, it is necessary to chuck the product with the product take-out device 30 before that. Therefore, the product extrusion device 20
The extrusion operation of the product 15 by the extrusion cylinder 26 and the extraction operation of the product 15 by the extraction cylinder 53 of the product extraction device 30 are performed in the same direction.

However, the product extruder 20 is an extrusion cylinder.
The extrusion speed of the product 15 is liable to fluctuate because of a simple configuration in which only the extrusion speed is adjusted by adjusting the flow rate of the working oil to the flow control valve 29 with the flow adjustment valve 29. On the other hand, the product removal device 30 is controlled by a proportional flow control valve 58 to a removal speed according to a preset operation program.

For this reason, the product extrusion device 20 and the product take-out device
There is a difference between the moving speeds of the devices 30 and the operation of the devices 20 and 30 is inconsistent. As a result, the product 15 extruded by the product
A situation occurs in which the product take-out device 30 is pushed through the device, and a large load is applied to each device 20, 30. Then, such a load causes a bending deformation or the like in a structurally weak portion such as the arm 32 of the product take-out device 30, which causes a problem of damage.

An object of the present invention is to provide a product take-out control device of a molding machine capable of eliminating an operation mismatch between the product extruder 20 and the product take-out device 30.

[0020]

SUMMARY OF THE INVENTION The present invention provides a product extruder for extruding a product molded in a mold, extrusion control means for controlling the product extruder, and a product for removing the extruded product from the mold. What is claimed is: 1. A product take-out control device for a molding machine, comprising: a take-out device; and a take-out control device that controls the product take-out device. And a synchronous control for detecting a stroke difference between the extrusion stroke and the ejection stroke when the product extrusion device operates and controlling the product ejection device to eliminate the stroke difference. Means.

At this time, the synchronous control means includes an opening / closing circuit for conducting a signal from the extruding stroke detecting means and a signal from the take-out stroke detecting means when the product extruding device is operated, and the opening / closing circuit being conducted. An operation circuit that detects and outputs a stroke difference between the extrusion stroke and the take-out stroke, and outputs the operation circuit to the product take-out device in place of the output of the take-out control means when the product extrusion device operates. It is desirable that the switching circuit be provided with a switching circuit for connection.

The product take-out device includes a cylinder for driving a product take-out portion, and a flow control valve for adjusting hydraulic oil to the cylinder. The synchronous control means and the take-out control means control the flow control valve. What is necessary is just to control. Further, the product take-out device may include a motor for driving a product take-out part and a feed mechanism, and the synchronous control means and the take-out control means may control the motor.

[0023]

[Operation] In the present invention, the product take-out device is normally controlled by the take-out control means similar to the conventional one.
During operation of the product extruder, the synchronous control means controls the product take-out device to operate synchronously in accordance with the operation of the product extruder. That is, the synchronous control means detects a stroke difference between the extrusion stroke detected by the extrusion stroke detection means and the extraction stroke detected by the extraction stroke detection means, and controls the product extracting device so as to eliminate the stroke difference. For this reason, the product take-out device moves at the same speed as the product extruder with a constant relative distance between each other, so that the operation inconsistency between the product extruder and the product take-out device, mechanical interference, etc., occur. Thus, the object is achieved.

[0024]

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the basic configuration of this embodiment is shown in FIG.
In order to control the product take-out device 30 based on the present invention, the product extruding device 20 is provided with an extrusion stroke detecting means 70, and the take-out control means 60 is connected with a synchronous control means 80. Have been. In the following description, for the sake of simplicity, the same parts as those in FIG. 4 are denoted by the same reference numerals, and the description thereof will be omitted. The different parts, the extrusion stroke detecting means 70 and the synchronization control means 80, will be described.

The push-out stroke detecting means 70 has a rotary encoder 71 supported by the movable die plate 11, and a pinion 72 attached to the detection shaft is engaged with a rack 73 fixed to the push-out cylinder 26. A pulse train corresponding to the rotation angle is output from the rotary encoder 71, and the amount of rotation is detected by counting the pulses,
From this rotation angle, the relative movement amount of the extrusion cylinder 26 and the movable die plate 11 can be detected.

The synchronization control device 80 includes a switching circuit 81 and a comparator.
Arithmetic circuit 82A consisting of 82 and D / A converter 83
And a switching circuit 84. The opening / closing circuit 81 is connected to each output of the extraction stroke detection means 62 and the extrusion stroke detection means 70, and receives a signal at the time of the extrusion operation of the extrusion control means 40. The signal from each of the stroke detecting means 62 and 70 is passed to the comparator 82 only during the pushing operation.

The comparator 82 compares and subtracts signals from the stroke detecting means 62 and 70 sent from the opening / closing circuit 81, and outputs a difference between the respective moving strokes to the D / A converter 83.
The D / A converter 83 converts the stroke difference sent from the comparator 82 from a pulse train digital signal to an analog voltage signal, and sends it to the switching circuit 84.

To the switching circuit 84, the output of the extraction control means 60 and the output of the extrusion control means 40 are input together with the output of the D / A converter 83. Normally, a command signal from the extraction control means 60 is selected, and the amplifier 61 is operated. The output of the D / A converter 83 is selected while the extrusion control means 40 causes the product extrusion device 20 to perform the extrusion operation, and the output of the proportional flow control valve 58 is controlled via the amplifier 61. Output to valve 58.

In the present embodiment, the product control unit 40 operates the product extruder 20 to extrude the product 15, and also controls the removal control unit 60 and the synchronization control unit 80.
To operate the product take-out device 30 to take out the product 15.

That is, the extrusion control means 40 is a product extrusion device.
When the 20 is operated, the switching circuit 84 is switched by a signal from the extrusion control means 40, and the control of the product take-out device 30 is transferred from the take-out control means 60 to the synchronous control means 80. The opening / closing circuit 81 is turned on by a signal from the extrusion control means 40, and the movement amount of the product extrusion device 20 detected by the extrusion stroke detection means 62 and the movement of the product removal device 30 detected by the removal stroke detection means 70. The amount is input to the comparator 82, and the control voltage corresponding to the stroke difference is input from the D / A converter 83 to the proportional flow control valve 58 via the switching circuit 84 and the like, and the take-out cylinder 53 of the product take-out device 30 is synchronized. Operation will be performed.

That is, for example, while the take-out cylinder 53 is stopped, the detection signal from the take-out stroke detection means 70 is zero, but the detection signal from the push-out stroke detection means 62 increases with the operation of the push-out cylinder 26. As a result, the stroke difference from the comparator 82 similarly increases, and the take-out cylinder 53 operated by the control voltage corresponding to this stroke difference operates in synchronization with the extrusion cylinder 26.

According to the present embodiment, the take-out operation control of the product take-out device 30 is normally performed by the take-out control means 60, but the take-out operation control of the product take-out device 30 is synchronized only during the operation of the product push-out device 20. Since the control is performed by the control unit 80, it is possible to reliably synchronize the movement states of the product extruder 20 and the product take-out device 30 during the overlapping operation.

In particular, in the synchronous control, the control of the product extracting device 30 is switched to the synchronous control means 80, and the product extruding device is controlled.
Since the control is performed so as to follow the actual operation state of the product 20, each synchronization state can be made accurate according to the actual operation of the product extrusion device 20. Further, since automatic follow-up synchronization is performed, adjustment work and the like for obtaining accurate synchronization can be greatly simplified.

Accordingly, the product extruding device 20 and the product removing device 30
In the overlapping operation, the movement speed of each device 20 and 30 can be prevented from causing a difference, the operation mismatch due to the fluctuation of each stroke difference, and the bending due to the increase of the load on each device 20 and 30 as in the past. Inconveniences such as deformation and breakage can be prevented beforehand.

Further, since the control is switched to the control by the synchronous control means 80 only at the time of the synchronous control, the basic control of the product take-out device 30 except the time of the synchronous control can be performed by the normal take-out control means 60, and the control of the existing device is performed. It can be easily implemented by application.

The present invention is not limited to the above embodiment, but includes the following modifications. For example, the D / A converter 8 of the synchronization control means 80
The reference level setting of the control voltage from 3 may be appropriately performed,
As shown in FIG. 2, when the control voltage is plotted on the vertical axis and the stroke difference between the product extruder 20 and the product removal device 30 is plotted on the horizontal axis, the control voltage is set to zero when the stroke difference is zero. It becomes a graph like On the other hand, when a bias is applied so that the control voltage becomes the predetermined value B when the stroke difference is zero, a graph like 83B in the figure is obtained. The bias voltage is adjustable, and the bias current of the proportional flow control valve 58 can be adjusted.

Further, in the above-described embodiment, the product take-out device 30 of a type that moves linearly in a plurality of axial directions has been described. However, the product take-out device 30 may be of a type using an articulated robot arm 32A. In this case, as shown in FIG. 3, a rack 65 may be attached to the upper saddle 33, and a rotary encoder 63 in which a pinion 64 is meshed may be provided to detect the take-out stroke.

Further, in the above-described embodiment, the take-out stroke detecting means 62 and the push-out stroke detecting means 70 have been described as a system using a rack pinion and a rotary encoder. A magnetic or non-magnetic stripe pattern may be formed on the rod or the like, and a stroke may be detected by detecting a pulse associated with the movement of the rod by a magnetic sensor or the like installed opposite to the fixed side. The method of detecting each stroke is not limited to the digital type, but may be an analog type or the like. In other words, it is only necessary that the push-out stroke and the take-out stroke of each of the devices 20 and 30 can be reliably detected.

The configuration of the synchronization control means 80 may be appropriately set. The configuration for calculating the stroke difference from the signals from the stroke detection means 62 and 70 and the specific configuration of the switching circuit 74 are arbitrary. Detection means 62, 70
In the case where is an analog type, all of the synchronization control means 80 may be an analog type, and the D / A converter 73 is unnecessary.

On the other hand, if the flow control valve 58 is a valve whose degree of valve opening is adjusted by a digital signal, the D / A converter 73 if all the stroke detecting means 62 and 70 or the synchronous control means 80 are digital. Is unnecessary. Note that the flow control valve 58 may be a servo valve or the like.

Further, in the above embodiment, the product extruder 20 and the product take-out device 30 are hydraulically driven, but each operating part may be air-driven or motor-driven. In the case of motor drive, a synchronous control means 80 may be connected to a motor driver instead of the flow control valve 58 in the above-described embodiment to control the drive motor control voltage and the like. In this case, since the forward / reverse direction switching can be performed by the driving voltage to the motor, the direction switching valve 57 and the like are unnecessary.

Each part of the die casting machine 10 in the above embodiment may have another configuration, and the drive system, valves and switching means necessary for the drive may be appropriately selected for implementation. The present invention is not limited to a horizontal die casting machine, but can be applied to a vertical type or another type of machine.

[0043]

As described above, according to the present invention, by controlling the product take-out device 30 so as to follow the product extruding device 20, it is possible to ensure the synchronization of each product, and the conventional product The operation mismatch between the extrusion device 20 and the product removal device 30 and various inconveniences caused by the mismatch can be solved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a graph showing a modification of the present invention.

FIG. 3 is a partial structural view showing a modification of the present invention.

FIG. 4 is a configuration diagram showing a conventional example.

[Explanation of symbols]

 10 Die casting machine as a molding machine 13 Moving die 14 Fixed die 15 Product 20 Product extrusion device 30 Product extraction device 40 Extrusion control means 53 Extraction cylinder 58 Flow control valve 60 Extraction control means 62 Extraction stroke detection means 70 Extrusion stroke detection Means 80 Synchronous control means 81 Switching circuit 82 Comparator 83 D / A converter 84 Switching circuit

Claims (4)

(57) [Claims] 1. A product extruder for extruding a product formed in a mold, extrusion control means for controlling the product extruder, a product ejector for extracting the extruded product out of the mold, and a product ejector for the product A product ejection control device for a molding machine, comprising: an ejection stroke detection unit that detects an extrusion stroke of the product extrusion device; and an ejection stroke that detects an ejection stroke of the product ejection device. Detection means, and synchronous control means for detecting a stroke difference between the extrusion stroke and the take-out stroke when the product push-out apparatus operates and controlling the product take-out apparatus so as to eliminate the stroke difference. Product removal control device of the molding machine. 2. A product take-out control device for a molding machine according to claim 1, wherein said synchronous control means includes a signal from an extrusion stroke detection means and a signal from said take-out stroke detection means when said product extrusion apparatus operates. An open / close circuit for conducting a signal, an arithmetic circuit for detecting and outputting a stroke difference between the extrusion stroke and the take-out stroke when the open / close circuit is electrically connected, and an arithmetic circuit for operating the product extrusion device when the product extrusion device operates. A switching circuit for connecting an output to a product take-out device in place of the output of the take-out control means. 3. The product take-out control device for a molding machine according to claim 1, wherein the product take-out device includes a cylinder that drives a product take-out part and a flow rate that adjusts hydraulic oil to the cylinder. And a control valve, wherein the synchronous control means and the discharge control means control the flow control valve. 4. The product take-out control device of a molding machine according to claim 1, wherein the product take-out device includes a motor for driving a product take-out portion and a feed mechanism, wherein the synchronous control means and A product removal control device for a molding machine, wherein the removal control means controls the motor.